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https://github.com/php/doc-zh.git
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149 lines
4.4 KiB
XML
149 lines
4.4 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<!-- EN-Revision: cd8b964b8566801265f0d287db6eb651f93be950 Maintainer: mowangjuanzi Status: ready -->
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<chapter xml:id="datetime.examples" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
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&reftitle.examples;
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<section xml:id="datetime.examples-arithmetic">
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<title>日期/时间算法</title>
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<para>
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以下示例展示了有关 DST 转换和具有不同天数的月份的日期/时间算法的一些缺陷。
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</para>
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<para>
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<example>
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<title>DateTimeImmutable::add/sub 添加包含经过时间的间隔</title>
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<simpara>
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在 DST 转换上添加 PT24H 似乎会增加 23/25 小时（大多数时区）。
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</simpara>
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<programlisting role="php">
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<![CDATA[
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<?php
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$dt = new DateTimeImmutable("2015-11-01 00:00:00", new DateTimeZone("America/New_York"));
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echo "Start: ", $dt->format("Y-m-d H:i:s P"), PHP_EOL;
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$dt = $dt->add(new DateInterval("PT3H"));
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echo "End: ", $dt->format("Y-m-d H:i:s P"), PHP_EOL;
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]]>
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</programlisting>
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&example.outputs;
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<screen>
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<![CDATA[
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Start: 2015-11-01 00:00:00 -04:00
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End: 2015-11-01 02:00:00 -05:00
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]]>
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</screen>
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</example>
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</para>
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<para>
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<example>
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<title>DateTimeImmutable::modify 和 strtotime 递增/减单个组件值</title>
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<simpara>
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在 DST 转换上添加 +24 小时将准确添加 24 小时，如日期/时间字符串中所示（除非开始/结束时间位于转换点）。
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</simpara>
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<programlisting role="php">
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<![CDATA[
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<?php
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$dt = new DateTimeImmutable("2015-11-01 00:00:00", new DateTimeZone("America/New_York"));
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echo "Start: ", $dt->format("Y-m-d H:i:s P"), PHP_EOL;
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$dt = $dt->modify("+24 hours");
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echo "End: ", $dt->format("Y-m-d H:i:s P"), PHP_EOL;
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]]>
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</programlisting>
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&example.outputs;
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<screen>
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<![CDATA[
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Start: 2015-11-01 00:00:00 -04:00
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End: 2015-11-02 00:00:00 -05:00
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]]>
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</screen>
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</example>
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</para>
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<para>
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<example>
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<title>新增/减去时间可能会溢出/下溢日期</title>
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<simpara>
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就像 1 月 31 日 + 1 月会导致 3 月 2 日（闰年）或 3 月 3 日（平年）。
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</simpara>
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<programlisting role="php">
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<![CDATA[
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<?php
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echo "Normal year:\n"; // 2 月有 28 天
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$dt = new DateTimeImmutable("2015-01-31 00:00:00", new DateTimeZone("America/New_York"));
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echo "Start: ", $dt->format("Y-m-d H:i:s P"), PHP_EOL;
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$dt = $dt->modify("+1 month");
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echo "End: ", $dt->format("Y-m-d H:i:s P"), PHP_EOL;
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echo "Leap year:\n"; // 2 月有 29 天
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$dt = new DateTimeImmutable("2016-01-31 00:00:00", new DateTimeZone("America/New_York"));
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echo "Start: ", $dt->format("Y-m-d H:i:s P"), PHP_EOL;
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$dt = $dt->modify("+1 month");
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echo "End: ", $dt->format("Y-m-d H:i:s P"), PHP_EOL;
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]]>
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</programlisting>
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&example.outputs;
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<screen>
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<![CDATA[
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Normal year:
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Start: 2015-01-31 00:00:00 -05:00
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End: 2015-03-03 00:00:00 -05:00
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Leap year:
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Start: 2016-01-31 00:00:00 -05:00
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End: 2016-03-02 00:00:00 -05:00
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]]>
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</screen>
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<simpara>
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要获取下个月的最后一天（例如防止溢出），可以使用 <literal>last day of</literal> 格式。
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</simpara>
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<programlisting role="php">
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<![CDATA[
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<?php
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echo "Normal year:\n"; // 2 月有 28 天
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$dt = new DateTimeImmutable("2015-01-31 00:00:00", new DateTimeZone("America/New_York"));
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echo "Start: ", $dt->format("Y-m-d H:i:s P"), PHP_EOL;
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$dt = $dt->modify("last day of next month");
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echo "End: ", $dt->format("Y-m-d H:i:s P"), PHP_EOL;
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echo "Leap year:\n"; // 2 月有 29 天
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$dt = new DateTimeImmutable("2016-01-31 00:00:00", new DateTimeZone("America/New_York"));
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echo "Start: ", $dt->format("Y-m-d H:i:s P"), PHP_EOL;
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$dt = $dt->modify("last day of next month");
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echo "End: ", $dt->format("Y-m-d H:i:s P"), PHP_EOL;
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]]>
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</programlisting>
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&example.outputs;
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<screen>
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<![CDATA[
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Normal year:
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Start: 2015-01-31 00:00:00 -05:00
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End: 2015-02-28 00:00:00 -05:00
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Leap year:
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Start: 2016-01-31 00:00:00 -05:00
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End: 2016-02-29 00:00:00 -05:00
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]]>
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</screen>
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</example>
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</para>
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</section>
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</chapter>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"~/.phpdoc/manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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